MCQ
In a reversible adiabatic process $\Delta S$ is :-
- AInfinity
- ✓Zero
- CEqual to $C_vdT$
- DEqual to $\left\{ {nR\ln \left( {\frac{{{V_2}}}{{V1}}} \right)} \right\}$
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$Mn^{2+} + 2e^- \rightarrow Mn,\, $$E^o = - 1.18\, V$
$Mn^{2+} \rightarrow Mn^{3+} + e^-,$ $ E^o = - 1.51 \,V$
The $E^o$ for the reaction $3Mn^{2+} \rightarrow Mn^o + 2Mn^{3+},$
and possibility of the forward reaction are respectively
${{C}_{6}}{{H}_{5}}OH\xrightarrow{NaOH}(A)$ $\mathop {\xrightarrow{{\;C{O_2}\;\;\;\;\;\;\;\;\;\;\;\;}}}\limits_{140\,^oC,\;(4 - 7\,)} (B)$ $\xrightarrow{{HCl}}(C),$
$(I)\,\,PCl_3$ hydrolyses in the presence of moisture giving fumes of $HCl$
$(II)\,\,PCl_5$ exists as $[PCl_4]^-[PCl_6]^+$ in solid state
$(III)$ All the five bonds in $PCl_5$ molecule are equivalent
Choose the correct statements
Statement $I :$ The presence of weaker $\pi$ - bonds make alkenes less stable than alkanes.
Statement $II :$ The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.